RKI Instruments 65-2390RK - Manual (Page 16)

12 • 65-2390RK Combustible Gas Transmitter
4. Disconnect the detector leads from the interconnect terminal strip.
5. Disconnect the wiring that connects the combustible gas transmitter to the controller
from the amplifier’s interconnect terminal strip.
6. Unscrew and remove the two screws that secure the amplifier to the junction box.
The screws are at the top left and bottom right of the amplifier.
7. Remove the amplifier.
8. Place the new amplifier in the same position as the amplifier you removed in the
previous step.
9. Use the two screws you removed in step 6 to secure the amplifier to the junction box.
10. Reconnect the wiring that connects the controller to the combustible gas transmitter at
the amplifier’s interconnect terminal strip as shown in Table 4 below and Figure 3 on
page 6 of this manual.
11. Reconnect the detector leads to the amplifier’s interconnect terminal strip as shown in
Table 5 below and Figure 3 on page 6 of this manual.
12. Turn on power to the controller.
13. Turn on the controller and place it into normal operation.
NOTE: When first powered up, the transmitter will enter about a one minute period
when the 4-20 mA output is stabilizing and may be above the controller alarm
points or well below zero momentarily. RKI controllers have a one minute
warmup period when the controller does not display any gas reading or give any
alarm indication. The combustible gas transmitter’s 4-20 mA signal should be
stable by the time the controller’s warmup period is over.
Table 4: Reconnecting the Combustible Gas Amplifier
to the Controller
Amplifier Interconnect
Terminal Strip
Controller
Transmitter Terminal
Strip (typical)
GND - (DC -)
4-20 4 - 20 mA (FB or S)
24V + 24V
Table 5: Reconnecting the Combustible Gas
Detector to the Amplifier
Detector Lead
Amplifier Interconnect
Terminal Strip
Red RED
White WHT
Green GRN
Black BLK